Backlight module and backlight system using same

Abstract

The present invention discloses a backlight module including a solar collector, a number of fibers, a light bar, an optical mixing block and a light guide plate. Each of the fibers includes a light incident end and a light output end. The solar light collector traces the sun and collects the solar light. The light incident ends are connected to the solar light collector and transmits the collected solar light to the light output end. The light bar includes a number of point light sources. The point light sources and the light output ends of the fibers are set on the light bar. The solar light collected by the solar light collector enters the optical mixing block to mix via the light output ends of the fibers and emits into the light guide plate to be spread as an even surface light source.

What is claimed is: 
     
       1. A backlight module, comprising:
 a solar light collector tracing the sun and collecting the solar light; 
 a plurality of fibers, each of the fibers comprising a light incident end connecting the solar light collector and a light output end, the light incident end transmitting the collected solar light to the light output end; 
 a light bar comprising a plurality of point light sources; 
 a optical mixing block; and 
 a light guide plate; 
 wherein the point light sources and the light output ends of the fibers are set on the light bar, the solar light collected by the solar light collector enters the optical mixing block to mix via the light output ends of the fibers and emits into the light guide plate to be spread as a even surface light source, and the point light sources give out a light to compensate lacks of chromaticity and brightness of the collected solar light. 
 
     
     
       2. The backlight module of  claim 1 , wherein the point light sources and the light output ends of the fibers are alternately set on the light bar along a longitudinal direction of the light bar. 
     
     
       3. The backlight module of  claim 2 , wherein an arrangement of the point light sources is alternately spaced blue point light sources and white point light sources. 
     
     
       4. The backlight module of  claim 2 , wherein an arrangement of the point light sources is orderly spaced red point light sources, green point light sources, and blue point light sources. 
     
     
       5. The backlight module of  claim 1 , wherein the optical mixing block comprises a light incident surface, a light output surface, and a refection surface connecting the light incident surface and the light output surface, the light come out from the point light source and the light output end of the fiber enters into the optical mixing block via the light incident surface, and the light strike on the reflection surface from inside of the optical mixing block is reflected back into the optical mixing block. 
     
     
       6. The backlight module of  claim 5 , wherein the optical mixing block is a orthogonal trapezoidal quadrangular which comprises an upper surface, a lower surface parallel to the upper surface and similar to the upper surface in shape, a front surface, a back surface parallel to the front surface but having different size with the front surface, an incline side surface obliquely connecting with the front surface and the back surface, and a rear surface perpendicularly connecting with the front surface and the back surface, the back surface is functional as the light incident surface, the rear surface is functional as the light output surface, the upper surface, the lower surface, the front surface and the incline side surface are functional as the reflection surface, the rear surface faces a incident side of the light guide plate, and a light emitting direction of the point light source and the light output end of the fiber on the light bar faces the back surface. 
     
     
       7. The backlight module of  claim 5 , wherein the optical mixing block is an orthogonal triangular prism which comprises a pair of rectangular side walls perpendicular to each other, a rectangular incline side wall obliquely connected to the rectangular side walls and a pair of triangular side walls correspondingly perpendicularly connected to the rectangular side walls and the incline side wall, the incline side wall is divided into an upper light output area and a lower light incident area, the incident surface of the light guide plate corresponds to the light output area, a width of the light output area is the same as the thickness of the light guide plate, the light guide plate is perpendicular to the incline side wall, the light bar is set below the light guide plate, a light emitting direction of the light bar is aligned with the light incident area of the incline side wall, the rectangular side walls and the triangular side walls are function as the reflection surface. 
     
     
       8. A backlight system comprising:
 a backlight module comprising: 
 a solar light collector tracing the sun and collecting the solar light; 
 a plurality of fibers, each of the fibers comprising a light incident end connecting the solar light collector and a light output end, the light incident end transmitting the collected solar light to the light output end; 
 a light bar comprising a plurality of point light sources; 
 a optical mixing block; and 
 a light guide plate; 
 wherein the point light sources and the light output ends of the fibers are set on the light bar, the solar light collected by the solar light collector enters the optical mixing block to mix via the light output ends of the fibers and emits into the light guide plate to be spread as a even surface light source, and the point light sources give out a light to compensate lacks of chromaticity and brightness of the collected solar light; and 
 a controlling module comprising: 
 a setting unit setting chromaticity coordinates of backlight, a brightness standard value and error ranges of the chromaticity coordinates and the brightness standard value; 
 a detecting unit detecting chromaticity coordinates and brightness value of the light from the light guide plate; 
 a comparing unit comparing a threshold of the error range of the chromaticity coordinates with the chromaticity coordinates of the light from the light guide plate and comparing a threshold of the error range of the standard brightness value with the brightness value of the light from the light guide plate; and 
 a regulating unit controlling the color of the point light source to shine according to the comparison between the chromaticity coordinates of the light from the light guide plate and the preset error range of the chromaticity coordinates to compensate the chromaticity deviation of the solar light and controlling the brightness of the point light source according to the comparison between the brightness of the light from the light guide plate and the standard brightness value to compensate lack of brightness of the solar light. 
 
     
     
       9. The backlight system of  claim 8 , wherein the chromaticity coordinates is (0.28, 0.29), and the error range of the chromaticity coordinates is (0.28+0.05, 0.29+0.05). 
     
     
       10. The backlight system of  claim 8 , wherein the brightness standard value is 5000 nits, and the error range of the brightness standard value is ±5%. 
     
     
       11. The backlight system of  claim 8 , wherein the point light sources and the light output ends of the fibers are alternately set on the light bar along a longitudinal direction of the light bar. 
     
     
       12. The backlight system of  claim 11 , wherein an arrangement of the point light sources is alternately spaced blue point light sources and white point light sources. 
     
     
       13. The backlight system of  claim 11 , wherein an arrangement of the point light sources is orderly spaced red point light sources, green point light sources, and blue point light sources. 
     
     
       14. The backlight system of  claim 8 , wherein the optical mixing block comprises a light incident surface, a light output surface, and a refection surface connecting the light incident surface and the light output surface, the light come out from the point light source and the light output end of the fiber enters into the optical mixing block via the light incident surface, and the light strike on the reflection surface from inside of the optical mixing block is reflected back into the optical mixing block. 
     
     
       15. The backlight system of  claim 14 , wherein the optical mixing block is a orthogonal trapezoidal quadrangular which comprises an upper surface, a lower surface parallel to the upper surface and similar to the upper surface in shape, a front surface, a back surface parallel to the front surface but having different size with the front surface, an incline side surface obliquely connecting with the front surface and the back surface, and a rear surface perpendicularly connecting with the front surface and the back surface, the back surface is functional as the light incident surface, the rear surface is functional as the light output surface, the upper surface, the lower surface, the front surface and the incline side surface are functional as the reflection surface, the rear surface faces a incident side of the light guide plate, and a light emitting direction of the point light source and the light output end of the fiber on the light bar faces the back surface. 
     
     
       16. The backlight system of  claim 14 , wherein the optical mixing block is an orthogonal triangular prism which comprises a pair of rectangular side walls perpendicular to each other, a rectangular incline side wall obliquely connected to the rectangular side walls and a pair of triangular side walls correspondingly perpendicularly connected to the rectangular side walls and the incline side wall, the incline side wall is divided into an upper light output area and a lower light incident area, the incident surface of the light guide plate corresponds to the light output area, a width of the light output area is the same as the thickness of the light guide plate, the light guide plate is perpendicular to the incline side wall, the light bar is set below the light guide plate, a light emitting direction of the light bar is aligned with the light incident area of the incline side wall, the rectangular side walls and the triangular side walls are function as the reflection surface.